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The Enhanced Graphics Adapter (EGA) is an IBM PC graphics adapter [2] [3] and de facto computer display standard from 1984 that superseded the CGA standard introduced with the original IBM PC, and was itself superseded by the VGA standard in 1987.
The EGA and many VGA clones allowed a split-box cursor (appearing as two rectangles, one at the top of the character box and one at the bottom), by setting the end of the cursor before the start, however if this is done on the original VGA, the cursor is completely hidden instead. [9]
Introduced on MCA-based PS/2 models in 1987, it replaced the digital TTL signaling of EGA and earlier standards with analog RGBHV signaling, using the synonymous VGA connector. As with EGA, the VGA standard actually encompasses a set of different resolutions; 640×480 is sometimes referred to as "VGA resolution" today, however as per the ...
A typical VGA card is also provide this port-mapped I/O segment: 0x3B0 to 0x3DF; Due to the use of different address mappings for different modes, it is possible to have a monochrome adapter (i.e. MDA or Hercules) and a color adapter such as the VGA, EGA, or CGA installed in the same machine.
Being completely dependent on the NTSC encoding/decoding process, composite color artifacting is not available on an RGBI monitor, nor is it emulated by EGA, VGA or contemporary graphics adapters. The modern, games-centric PC emulator DOSBox supports a CGA mode, which can emulate a composite monitor's color artifacting. Both 640 × 200 ...
The PS/2 chipset's limited abilities prevent EGA compatibility and high-resolution multi-color VGA display modes. The tenure of MCGA was brief; the PS/2 Model 25 and Model 30 were discontinued by 1992, and the only manufacturer to produce a clone of this display adapter was Epson , in the Equity Ie and PSE-30 , since the VGA standard introduced ...
The signal standard and pinout are backward-compatible with CGA, allowing EGA monitors to be used on CGA cards and vice versa. Early VGA cards also used this connector. VGA connector (DE-15) Became a nearly ubiquitous analog computer display connector after first being introduced with IBM x86 machines. Older VGA connectors were DE-9 (9-pin).
TGA graphics are built into the motherboards of Tandy computers. The PCjr uses a custom monitor with a unique 18-pin plug, [15] but an adapter (with the same DE-9 connector and pinout as IBM's CGA/EGA) can connect it to the IBM Color Display or similar 4-bit digital RGBI monitor. [16] The Tandy 1000 provides the DE-9 connector directly. [17]
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